package com.sky.aspect;


import com.sky.anno.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import com.sky.exception.BaseException;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Slf4j
@Component
public class AutoFillAspect {

    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.anno.AutoFill)")
    public void autoFillPointCut(){}

    /**
     * 通知 自动填充公共字段
     * @param joinPoint
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("公共字段自动填充...");
        //获得方法签名对象
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();

        //获得方法上的注解
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);

        //获得注解中的操作类型
        OperationType operationType = autoFill.value();

        //获取当期目标方法的参数
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }

        //实体参数
        Object entity = args[0];

        //准备赋值的数据
        LocalDateTime time = LocalDateTime.now();
        Long empId = BaseContext.getCurrentId();

        if (operationType == OperationType.INSERT){
            //当前执行的是insert操作，为4个字段赋值
            try{
                //获得set方法对象---Method
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射调用目标对象的方法
                setCreateTime.invoke(entity,time);
                setUpdateTime.invoke(entity,time);
                setCreateUser.invoke(entity,empId);
                setUpdateUser.invoke(entity,empId);
            }catch (Exception e){
                log.error("公共字段自动填充失败：{}",e.getMessage());
                throw new BaseException(MessageConstant.AUTO_FILL_FAILED);
            }
        }else {
            try {
                //当前执行的是update操作，为2个字段赋值
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射调用目标对象的方法
                setUpdateTime.invoke(entity,time);
                setUpdateUser.invoke(entity,empId);
            } catch (Exception e) {
                log.error("公共字段自动填充失败：{}",e.getMessage());
                throw new BaseException(MessageConstant.AUTO_FILL_FAILED);
            }
        }
    }
}
